MACKIE HDR24/96 - Manual (Page 209)

HDR 24/96
Pin Signal Pin Signal
1 Ch 8 Hot 14 Ch 8 Cold
2 Ch 8 Ground 15 Ch 7 Hot
3 Ch 7 Cold 16 Ch 7 Ground
4 Ch 6 Hot 17 Ch 6 Cold
5 Ch 6 Ground 18 Ch 5 Hot
6 Ch 5 Cold 19 Ch 5 Ground
7 Ch 4 Hot 20 Ch 4 Cold
8 Ch 4 Ground 21 Ch 3 Hot
9 Ch 3 Cold 22 Ch 3 Ground
10 Ch 2 Hot 23 Ch 2 Cold
11 Ch 2 Ground 24 Ch 1 Hot
12 Ch 1 Cold 25 Ch 1 Ground
13 NC
If you need unbalanced connections, we recommend that you wire
the DIO-8 connector with two conductor shielded cable as if you were making balanced
connections, and then wire them unbalanced on the other end by connecting the cold lead to the
sleeve (ground) of the unbalanced plug.
OPT-8 8-channel ADAT Optical Digital I/O
The OPT-8 provides 8 channels of 24-bit digital input and output on a pair of TOSLink fiber optic
connectors using the ADAT Optical (Lightpipe) format. This card is appropriate for interfacing the
HDR24/96 with a digital console equipped with similar format inputs and outputs, such as the Mackie
d8b. The OPT-8 operates at 44.1 or 48 kHz sample rates and depends on outboard A/D and D/A
converters to get in from and out to the analog world.
Inputs Outputs
The OPT-8 has one optical connector for input and one for output. It uses standard TOSLink
plastic fiber optic Lightpipe cables. The maximum recommended length is 10 meters. While
longer cables are available from some sources, we can’t assure you that they’ll work reliably.
The AIO-8 provides embedded word clock on its output in accordance with the ADAT standard,
but it does not recognize (nor synchronize to) embedded word clock on its input. The preferred
clocking method is to use an external word clock connection between the HDR24/96 and the
device(s) connected to the OPT-8.
When connecting to an Alesis ADAT recorder to transfer a multitrack project in or out, the
HDR24/96 must provide word clock to the recorder. Therefore, even if you’re copying from the
ADAT into the HDR24/96, you must connect the OPT-8 Output Lightpipe to the ADAT Input to
provide the clock signal. Set the HDR24/96’s Clock Source either to Internal or to External
Word Clock if you have a house standard clock generator. Set the ADAT’s Clock Source to
Digital Input. Be sure the ADAT and HDR24/96 are set for the same sample rate.
In the dark about which Lightpipe cable or connector is the input and which is the output? It’s
perfectly OK to make Lightpipe connections with the equipment powered up. Just look at the
connector or cable end. If there’s a red light glowing, it’s an output. If it’s dark, it’s an input (or
else it’s disconnected at the other end). Connect light to dark and you’ll be doing the right thing.
Technical Reference 209